set tmp_memory_table_size=0 ;
create table folks(id int, name char(32 ), dob date, father int, mother int);
insert into folks values
(100 , 'Me' , '2000-01-01' , 20 , 30 ),
(20 , 'Dad' , '1970-02-02' , 10 , 9 ),
(30 , 'Mom' , '1975-03-03' , 8 , 7 ),
(10 , 'Grandpa Bill' , '1940-04-05' , null, null),
(9 , 'Grandma Ann' , '1941-10-15' , null, null),
(25 , 'Uncle Jim' , '1968-11-18' , 8 , 7 ),
(98 , 'Sister Amy' , '2001-06-20' , 20 , 30 ),
(7 , 'Grandma Sally' , '1943-08-23' , null, 6 ),
(8 , 'Grandpa Ben' , '1940-10-21' , null, null),
(6 , 'Grandgrandma Martha' , '1923-05-17' , null, null),
(67 , 'Cousin Eddie' , '1992-02-28' , 25 , 27 ),
(27 , 'Auntie Melinda' , '1971-03-29' , null, null);
call mtr.add_suppression(".*marked as crashed.*" );
SET @saved_dbug= @@SESSION.debug_dbug;
SET SESSION debug_dbug="+d,ha_rnd_next_error" ;
SET @ha_rnd_next_error_counter=110 ;
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
w_id, w_name, w_dob, w_father, w_mother)
as
(
select h.*, w.*
from folks h, folks w, coupled_ancestors a
where a.father = h.id AND a.mother = w.id
union
select h.*, w.*
from folks v, folks h, folks w
where v.name = 'Me' and
(v.father = h.id AND v.mother= w.id)
),
coupled_ancestors (id, name, dob, father, mother)
as
(
select h_id, h_name, h_dob, h_father, h_mother
from ancestor_couples
union
select w_id, w_name, w_dob, w_father, w_mother
from ancestor_couples
)
select h_name, h_dob, w_name, w_dob
from ancestor_couples;
ERROR HY000: Table '(temporary)' is marked as crashed and should be repaired
drop table folks;
set tmp_memory_table_size=default;
SET @@SESSION.debug_dbug=@saved_dbug;
Messung V0.5 in Prozent C=78 H=100 G=89
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-10-08)
¤
*© Formatika GbR, Deutschland